Exhaust-steam injector



Jan. 3, 1928.

' E. RAWsoN EXHAUST STEAM INJECTOR INVENTOR. EMANUEL RAWSON m W` w m &

f' ATTORNEY.

Jan. 3, 1928.

E. RAWSON EXHAUST STEAM INJECTOR eets-Sheet 2 Filed Jan. 28,l 1926INVENTR. EMANUEL RAM/50H A TTORNEY.

to inodiiication of -thevalve illustrated in Fig.

, EMNUEIQSRAWSQN, 'on Jn xH5 calfeget. al.1,asA adaptedto/be operated=by ,compania voir NEW1-'fvo1ix,.1v..v.

Rszv o1TY,.N,EW grnnsnxifisslsuonrro,.SUBERHEATER*Eliminer-STEAMrmncron.'

Application -le {anuary ThefpreseuitV invention*A relates to exhauststeam-fjinifectorsfV andcliis particular r `refer- -ence'to the typedisclosedv iin U1 S. -Pa-tentNo.

1,342,128, -njranted .June 1, 11920 "to J. v l-'Met- `11i-plied: toloccmotives', the injector may be opeiatedxizeither by 'exhaust or livesteam, as engrine- 'conditionsdict-ate, andI the several 'e steam supplyv conduits` leading tof the -f injector are 'controlledby-luidactuatedfvalves which :are-in fturn-controlled from `the cab bytheienfgineer;nlnforder to secure proper "controlofitlie injector,`it isnecessary that -the exhaust steami inlet fbe valved so lthat it 1 4tbeclosedi at the will, ofthe'` operator, and it isvturth'ermore necessarythat this valve should close 4aga-inst a positive pressure .within the`inj ector,v inn-order to prevent the :passagev ofilive vsteam-into theexhaust steam lcfmdiuit' Wlienxthe injectoris being operated iv-hollyibylive steam. f -i A il number f offvalves have heretofore -been-sugafested:I :for f `this purpose, but* because 'ol' Y vthewidelyxfacying steam conditions on both sides of the valve Vunderdiierent injector 2opeiwtin conditions, p thef operation of the priorI:valves 'has been:l unsatisfactory.

The principal object of the present invention is thereforeltheprovisionOtan im* proved term ofexhauststeam valve, which may be fremotelycontrolled, which will" effectively closefthe"exhaust Vrsteam conduitVagnimst awlivesteam pressure within the 1n- Y iector, lancl'\vlii'c hwill :operate smoothly and efficiently underfall lsteam conditions whichmay exist Within'ltheinjector. 'Further and more detailed Vobjects oflthe l inventionv Will i appris-iras vthe .following description, whichis tobeftalren.inconjunction Withthe ac` ccmpanyinqj drawings, proceeds.lathe drawings, Fig. l is avertical section Vtaken ythrough the *center*line l ofan injector ot .the f .type hereinbetore referred to",towvhich, a 'valve'embodyingI the inven-V tionahas beenapplied. Fig. 2is a `fragmentarvsection' similar to 'Fior l, showing a 1. Fig. .3auvieiv'siniilar to Fig. 2, showing` another' 'imodiicaltionot `theinvention, and' Fig. l is a section taken-on the lineal-#Jlo.-5`ig.1f.-- {Figi-:5 :is'alragmentary View` 28;",1926l Y#aerial No;$4,472. l

,similar to'lFig-- l, showing anotherform-fdf .valve appliedfto* theinjector; e alliddig.V Gkis" 'l' isha `fragmentary"section onfailagrgerue; taken along-the lfmei-#T (3f-Fig; (5s-md Fig. 8 Aal transverseseetionalso v on a larger zi'scctionhtaken 1onfthe lined-Goff Figf.

@do Y p ileitlrenfalong.thelineffoffFig. 6.*

.aina-in housing or'ca'singt formedr'by K combi-ning tube -Gandthefdeliveryllnozle`7, l

:wh ich 'discharges by1Wayjolithepassage and :check valve -9f intothe;pipe ll0-'le,adii'rgi to fthe boilercheck valve.'l inasmuch 'asjthisportion of i thetappar-atus' is a. ``linovv/"ifi form, it -Y is-notbelievedv necessary; to describe itin Yany furtherdet-ail. is s is`lusual in this-:type io'ffinjector, *the housing -l is extended`and-f'enlarged i beyond Y the inlet end-ot A`nozzle-3 toformV'afst'eain` chamber ll', lto Iwhich isdelivered 'itheriex- Ahaustf orilive steam,depending'uponthe5 Y, yecto@` operating l conditions-,13forfsupply-ing ini communication ,byway rif/portl lpivvith'" anysuitable source t'or'l live I 1 steamv lsupply which may; be remotelycontrolled through* al m e'chanismA such vas I' that described Patent53l,004, hereinbefore; l referred v'-"to iglrf press-ure fliveflst'eam,x *hereii'iafterfre tei-red to asl ""supple'mentlt l steam,issup-rv plied by *suitablycontrolled nrcan`s,fnotkv used, control meansmustbefprovidedgirnthe Y exhaust lsteam inlet to the '-inj-ectornot onlyim, Y

y ico i Vshoivnuto thesupplementallsteambnozilel Y Y control means inthe form of a fluid actuat'ed valve of novel construction, which issubstantially balanced in either closed or` open position, regardless ofthe steam conditions existing in theinjector. As shown in Fig. 1, theexhaust steam inlet 121s in Vcommunication with the steam chamber 11 byWay'of `a cylindrical` extension 19 ot the latter, and-in this extensionthere is slidablv 7mounted a hollow sleeve valve 20 betWeeh Which andtheinjector casing l, a steamtight joint is maintained byV means or"suitable packing rings 21. The internal Webbing of the injector housing,which forms the steam passages 14 and 17 land a support for thel nozzle16, is extended to form an open-ended sleeve 22 centrally aligned Withthe exhaust steam inlet 12. `The sleeve 22 is internally threaded toreceive an annular valve seat member 28, having la face 24 against whichthe end face of valve 21 seats when the latter is in closed position.The valve 2O is provided with radially extending arms 25 Which supportcentrally of the valve a stem 26, to the end of which is secured apiston 27 slidably mounted Within the central annular portion of themember 23. The latter is provided with an annular face 28, Which servesnot only as a stop limiting the open position of valve 20, but which,When-,the valve is in open position, forms with the piston 27 asteam-tight joint closing one end of the cylinder formed lby the centralportion of the member 23. The other end of this cylinder is formed bythe plug 29, and a passage 30 cored out of the supporting Web formed inthe injector housing connects the cylinder With conduit 3,1 leading froma suitably controlled source of fluid pressure. A helical spring 32,rest- 'A ing at one end against the arms 25 of valve 20 and at the otherend held by the annular backing ring 33, Which is suitably secured intheinjector housing, serves to hold the valve 20 normally inV closedposition, as indicated in F ig. 1. When desired, valve20 is opened bymeans of fluid under pressure admitted through conduit 31 and passage 30and'acting onpiston 27 Yto move the latter, and with it valve 20, to theright. InV

order to reduce the friction incident to moving -the valve and also thenumber of parts,

piston 27 is not provided with packing rings, but leakage past thepistonl When the latter is held in open position by fluid pressure, isprevented by the piston 27 seating against the annular face 28.

With the valve in the position shown in Fig. 1, communication betweenYthe steam chamber 1.1 and exhaust steam inlet 12 is out off and theinjector may be run by aux- 'p valve is' opened.

stantial balance also lholds true regardless iliary live steam admittedthrough the steam passage 14. It is tobenoted that under theseconditions, the live steam lilling the chamber 11 exerts no pressuretending to open or' close valve 20.y this feature'being of importance,as a comparatively light spring issuicient to keep the valve in closedposition. Because ot' the light spring which it is possible to use vWiththis construction, thc operating piston 27 and its cylinder may becomparatively small and it is possible toV locate them in the mostvadvantageous posi` tion directly Within theinjector Without undulyrestricting the Vsteam passagev therethrough. Moreover, when exhauststea'm'is admitted through the inlet 12 Withthe valve in closedposition, the steam pressure exerted on the valve isfsubstantiallybalanced and this condition continues veven after the This condition ofsuhof the presence or absence of live steam in thechamberll, so thatunder all operating conditions the force tending to close the vvalve issubstantially the same-that is, the force `exerted by the-spring .32.Due to the uniformity of force required to be overcome by piston 27 theaction of the valve in opening andclosing even and smooth, and theshocksdne' tothe sudden application of unbalanced forces tending-tothrow the valve violently to either closed or open position andresulting in strains and damage to the valve mechanism are avoided. AsWill also be apparent from the figure, this valve construction alsopermits oflarge and compara-v tively unobstructed stcam passagesconnectchamber 11.

In Fig. 2 there is illustrated a second Jform of valve, in Which thegeneral construction is similar to that just described but in ing` theexhaust steam inlet 12 vwith the e ivhich the spring arrangement forclosingthe valve-.has been slightly modified. in this form the-sleeveportion of the valve 20a is spacedy from the injector 'housing 1and a shoulder 20"'is provided on the valve, serving as a stop for oneend oilV the spring 32.y which is locatcdin the annular 'space loetiveenthe .sleeve portion of the valve 'and the injector housing.` As in theform previonsly described, the other end-oitI the springllt) is held bya backing ring 33 fixed in the 1nt ing ringand serve to form asteam-tight1 surface oi" the sleeve portion exhaust steam inlet l2 iseffectively closed.Y

As will he readily apparent .from the iigure this. valve construction isessentiallyV the the arms 47 enables the valve to be substanf tiallysupported at two points, and as will readily be apparent, thisadditional support may be provided in the valve forms shown in thepreceding figures.

It will be obvious from the 'foregoing description that the presentinvention may be j embodied in many different forms, and it is to beunderstood that the forms herein shown and described are to be taken asillustrative and not limiting in sense, and that many variations andvmodifications may be made within the scope of the invention as definedin the appended claims.

lVhat I claim is: f

1. In anV exhaust steam injector, an exhaust steam nozzle. a chambercommunicating therewith having inlets supplying exhaust vand live steamthereto, and avvalve located in said chamber intermediate said inletsfor closing communication there between, said valve being substantiallyfree in all positions fromv unbalanced pressure exerted by steam fromeither of said inlets.

2. In an exhaust steam injector, an exhaust steam nozzle, a chambercommiinicating therewith having inlets supplying ex-` haust and livesteam thereto, a valvelocated in said chamber intermediate said inlets,tor closing communication there-between, resilient means acting toclose said valve and fluid pressure actuated means ttor openingingtherewith having inlets supplyingex-V haust and live steam tosaidchamber, va valve located in said chamber yintermediate said inletsfor closing communication therebetween, said valve beingsubstantiallyfree in all positions from unbalanced pressure exerted bysteam from either ot .said inlets, a spring acting to close said valve,vand a luid pressure actuated piston for opening.

said valve against said spring.

4. In an exhaust steam injector,a housing forming a steam chamber havinglive and exhaust steam inlets, an annular valve seat mounted in saidchamberV intermediatesaid inlets, a sleeve valve mounted in said chamberand having an end face engaging said seat to close said exhaust steaminlet, resili?.

ent means acting` to close said valve, and fluid pressure means foropening it. Y 5. In an exhaust steam injectonthe combi'- nation with ahousing forming a steam chamber having live and exhaust steam inlets andcarrying an annular valve seat and a cylinder arranged concentrically otsaid seat; oli a `sleeve valve having an end tace engaging said seat toclose said exhaust steam inlet, a`

6. In an exhaust steam injector, the combination with-a housing formingasteam chamber having live and exhaust steam inlets and carrying anannular valve seat and a cylinder arranged concentrically of said seat;of a sleeve valve having an end tace engaging said seat tov close saidexhaust steam inlet,

a. piston mounted on said valve in alignment f therewith and disposed insaid cylinder, a

valve seat within said cylinder at one end thereof, and a tace on saidpiston engaging said last named seat when said valve fully openedposition.l

7. In an exhaust steam injector, the com! is in' bination with a housingforming a. steam f chamber and having an exhaust steam inlet'r therein;of an annular valve seat mounted-in said housing transversely of saidinletsand concentric therewith, a'sleeve valve slidably engaging saidhousing and having an end face engaging said seat to close said inlet, ahelical spring vmounted within said valve sleeve and actingto .closesaidvalve, and- Openingk fluid pressure actuated means: for said valveagainst said spring.

8. In an exhaust steam injector,

the comf A bination with a housing forming a steam chamber having anexhau'st'steam inletl .sur-x rounded by an annular recess, of anVannular valve seat mounted in said housing` transversely of said inletand concentric there with, a sleeve valve slidably mounted insaid recessand having an end tace .engaging said seat to close said inlet, a springlocated in said recess acting to close said valve, and

fluid pressure means tor opening said valve against said spring. I

9. In an exhaust steam injector, thek combination with ahoiising forminga steam chamber and having an exhauststeam inlet therein, of an annularvalve seat mountedfin said housing adjacent said inlet, a sleeve valveslidably mounted in said housingl and having an end tace engaging saidVseatto close said inlet, said valve being constructed and arrangedsothat steam entering said chamber from said inlet flows through saidvalve, resilient means acting to ,close said valve, and fluid pressuremeans for opening said valve against said first named means.

10.1'In an exhaust steam injector, the combination with a. housingforming a steam chamber and having an exhaust steam inlet therein, ot asleeve valve mounted transversely of said housing and. acting to closesaid inlet, resilientv means actingto close said valve, and fluidpressure means for opening said valve against said iirst named means,

said valve being constructed and arranged 1,654,896 I Y B f so that whenin open position it lies outside Y ports therein aording the solecommunication' between said inlets, an annular valve Seat formed in saidweb between said ports, a sleeve valve slidably mounted within said weband having an end face engaging said seat to close communication betweensaid ports, a spring mounted Within said web for closing said valve,said valveV and spring being removable from said housing through saidweb7 and fluid pi'essure actuated means for opening said valve. j Y

l2. In an exhaust steamY injector, the combination with a housing havingan exhaust steam inlet,'of a pair of annular valve seats mounted withinsaid housing adjacent to said inlet, a double-seated sleeve valveslidably mounted within saidhousing and engaging Said seats to closesaid inlet, resilient means acting to close said-valve, and fluidpressure actuated mean for opening said valve. Y

13. In an exhaust steam injector, the combination with a housing havinga cylindrical extension terminating in an exhaust steamy inlet; of avalve seat member mounted in said housing, said member comprising apairof spaced annular valve seats-located transversely of and' concentricwith said exten-` sion, a double-seated sleeve valve slidablyl mountedin said extension and engaging said valve seat to close saidinlet,resilient meansV for closing saidvalve, fluid pressure actuated meansfor opening said valve, said valve bef v ing constructed and arranged toform when in open position a steam passage through the vvalve and asecond annular steam passage between the valve and the extension of saidv housing.

14. In an exhaust'steam injector, the combination with a housing havinga cylindricaly extension terminating in an exhaust steam inlet; of a`valve member located in said housing adjacent said inlet, -said membercomprising a pair of spaced annular valve seats located transversely ofsaid inlet andV concentric therewith, a cylinder mounted concentricallyof said valve seats, a ported Vbacking plate mounted in said inlet andghav-V ing a Vbearing in alignment with said cylinder, a double-seatedsleeve valve having a stem mounted at one end in saidY bearing andterminating at its opposite end in a piston slidably mounted in saidcylinder, ya spring v mounted between said valve andsaid backing platefor closing said valve, and means for supplying fluid pressure to saidcylinder to actuate said piston and said valve.

EMANUiaLlRAwsoN. i,

